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United States Patent | 6,188,287 |
Avanic ,   et al. | February 13, 2001 |
A phase noise optimization circuit (208) minimizes phase noise for a voltage controlled oscillator (VCO) (202). Control circuitry (214) locates a minimum phase noise region for VCO operation based on the slope of the VCO's changing control voltage (206) versus changing bias voltage (204) for a bias voltage range. The control circuitry (214) then adjusts the bias input so that the VCO operates in a region of minimum phase noise.
Inventors: | Avanic; Branko (Miami, FL); McKinney; John K. (Plantation, FL); Poggiali; Frank A. (Lauderhill, FL) |
Assignee: | Motorola, Inc. (Schaumburg, IL) |
Appl. No.: | 406432 |
Filed: | September 27, 1999 |
Current U.S. Class: | 331/11; 331/16; 331/17; 331/25; 331/177R; 331/177V |
Intern'l Class: | H03L 007/085; H03L 007/099 |
Field of Search: | 331/17,16,10,11,25,177 R,177 V |
4156204 | May., 1979 | Hargis | 331/12. |
4270098 | May., 1981 | Bowman | 331/96. |
4270213 | May., 1981 | Falk et al. | 455/77. |
4336505 | Jun., 1982 | Meyer | 331/1. |
4454483 | Jun., 1984 | Baylor | 331/11. |
4574243 | Mar., 1986 | Levine | 328/155. |
4590602 | May., 1986 | Wolaver | 375/120. |
4609884 | Sep., 1986 | Kindinger et al. | 331/109. |
4714899 | Dec., 1987 | Kurtzman et al. | 331/1. |
4764737 | Aug., 1988 | Kaatz | 331/1. |
4975650 | Dec., 1990 | Martin | 328/133. |
5059927 | Oct., 1991 | Cohen | 331/77. |
5382921 | Jan., 1995 | Estrada et al. | 331/1. |
5389898 | Feb., 1995 | Taketoshi et al. | 331/2. |
5604465 | Feb., 1997 | Farabaugh | 331/10. |
5686864 | Nov., 1997 | Martin et al. | 331/1. |
6091303 | Jul., 2000 | Dent | 331/2. |